OMV 5.x: Wake On LAN (WOL) setup is not working

Hello,

I have activated the WOL feature via the WEB-GUI 'OMV -> System -> Network -> Interfaces -> Edit <deviceName> -> Advanced settings -> Wake-on-LAN', if I check this setting on command line with
ethtool <deviceName>
then I get
Wake-on: d
instead of the required
Wake-on: g
What I have to do to get this setting corrected? Thanks!

Bye!

_Michael_

P.S. I was trying to modify /etc/network/interfaces but this is "forbidden", says the file header.

I made changes to this setting several times. I also manually activated WOL via
ethtool -s <deviceName> wol g
then cleared the option in the OMV GUI and then checked if that was made -> also no effect; yes, I did some reboots.

WOL is working when I activate the option via the command line, I don't touched the above mentioned file.

Thank you malcom, I have it now running (w/o the MTU change). I cannot tell what exactly did resolve the issue (I deactivated 'Autoshutdwon' as well as changed some of its options for the next activation). This strange behaviour cost me more than 3 hours … and now that I have submitted a forum post it gets solved in 15 minutes by ??? changes ...